Surging-reduction low-noise blower impeller with adjustable blade angle

Abstract

The invention discloses a surging-reduction low-noise blower impeller with an adjustable blade angle. The surging-reduction low-noise blower impeller comprises a plurality of blades and a hub for fixing the blades, wherein the thicknesses from the front edge to tail edge of each blade are different, each blade comprises 6-20 toothed blocks molded at the tail edge and lugs which are molded at the outer diameter of the blade and are protruded out of two surfaces of the blade, and each blade also comprises a mounting shaft connected with the hub, the mounting shafts are provided with round flanges; the hub is formed by connecting two hub disks, and the connecting surfaces of the two hub disks are provided with mounting grooves for fixing the mounting shafts and flange grooves for fixing the flanges.

Description

technical field [0001] The invention relates to the technical field of fans, in particular to a surge-reducing and low-noise fan impeller with adjustable blade angles. Background technique [0002] The current domestic high-speed rail and subway tunnels generally use fans for ventilation. When the axial flow fan is working, the gas backflow will cause the fan to vibrate due to insufficient air outlet pressure or strong pressure difference. This is the surge phenomenon of the fan. The surge phenomenon can seriously damage the fan and even the ventilation ducts connected to the fan. Especially for fans installed in high-speed trains, bullet trains, subways and subway tunnels, when the train passes through the tunnel, there will be an air pressure difference that causes the pressure at the tuyere to drop sharply in an instant, that is, a strong pressure difference will be generated, resulting in severe surge phenomenon; although the high-speed train The air pressure in the car...

AI Technical Summary

Problems solved by technology

[0002] The current domestic high-speed rail and subway tunnels generally use fans for ventilation. When the axial flow fan is working, the gas backflow will cause the fan to vibrate due to insufficient air outlet pressure or strong pressure difference. This is the surge phenomenon of the fan. The surge phenomenon can seriously damage the fan and even the ventilation ducts connected to the fan

Especially for fans installed in high-speed trains, bullet trains, subways and subway tunnels, when the train passes through the tunnel, there will be an air pressure difference that causes the pressure at the tuyere to drop sharply in an instant, that is, a strong pressure difference will be generated, resulting in severe surge phenomenon; although the high-speed train The air pressure in the car is maintained by the smart piston in the car, but because the speed of the high-speed train is relatively high, the airflow around the train will become unstable due to the high speed of the train. Excellent performance resistance, preventing and improving the surge caused by pressure difference, especially when the fan installed in the tunnel makes the replacement and maintenance work difficult

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